Gonadotropin releasing hormone (GnRH) affects precopulatory behavior in testosterone-treated geldings

McDonnell, Sue M.; Diehl, N.K.; Garcia, M.C.; Kenney, R.M.

doi:10.1016/0031-9384(89)90177-7

Cited by 16 publications

(5 citation statements)

References 15 publications

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“…In female rats, GnRH can facilitate lordosis behavior [29,30] and anti-GnRH injected into the mid-brain central gray [31] or the lateral ventricles [32] caused a blockage or reduction of the behavior. Moreover, GnRH influences sexual behavior in monkeys [33] and horses [34]. The present results suggest that GnRH also influences a bovine sexual behavior, standing estrus.…”

Section: Discussionmentioning

confidence: 70%

Gonadotropin-Releasing Hormone in Third Ventricular Cerebrospinal Fluid of the Heifer During the Estrous Cycle1

Yoshioka

Suzuki

Arai

et al. 2001

Biology of Reproduction

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The release profile of GnRH in cerebrospinal fluid (CSF) and its correlation with LH in peripheral blood of ovary-intact heifers during the estrous cycle were investigated. A silicon catheter was placed into the third ventricle of six heifers using ultrasonography. During the mid-luteal phase, the heifers were injected with prostaglandin F(2alpha) to induce luteolysis. Surges of CSF GnRH (66.7 h after prostaglandin F(2alpha) administration) and peripheral LH (66.3 h) occurred simultaneously and were coincident with the onset of estrus (67.0 h). Duration of elevated GnRH concentration considerably overlapped with the estrous phase in each of the heifers. Mean pulse frequencies of both GnRH and LH were significantly higher during the proestrous and early luteal phases than during the mid-luteal phase, while mean concentration and pulse amplitude of both GnRH and LH were not different between these three phases. Of all the GnRH pulses identified, more than 80% were accompanied by an LH pulse during the proestrous and early luteal phases. However, the proportion of GnRH pulses that were coincident with an LH pulse during the mid-luteal phase decreased to 60%. The results clearly demonstrate that a dynamic (pulse) and longer-term (surge) changes of GnRH release into CSF are physiologically expressed during the estrous cycle in heifers, and the pattern of pulsatile GnRH secretion in heifers depends upon their estrous cycle.

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Section: Discussionmentioning

confidence: 70%

Gonadotropin-Releasing Hormone in Third Ventricular Cerebrospinal Fluid of the Heifer During the Estrous Cycle1

Yoshioka

Suzuki

Arai

et al. 2001

Biology of Reproduction

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“…Although SEAM was previously studied largely in a solitary context, it was also reported to co-occur when feral or pastured males are in close proximity to other males or stalled but within visual access [ 24 , 50 , 51 ]. This study found that in 19 of 49 (39%) observations of E/M, ponies were directly touching or within one body length of another male pony.…”

Section: Discussionmentioning

confidence: 99%

Aggression, Erection, and Masturbation in Feral Pottoka Ponies and Implications for Equine Welfare

Grillaert¹

2022

Animals

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Erection and masturbation in horses are considered unwanted behaviors in training contexts, despite recognition that these are naturally occurring behaviors that are integral to the welfare of male horses. Equestrians, especially those who use positive reinforcement in their training, expressed concern that the presence of such behaviors might be associated with aggressive or sexual behaviors aimed at humans participating in horse-human interactions. The implications of such attitudes could negatively affect male horses by excluding them from welfare-friendly training systems. In this study, feral stallions were observed to describe and quantify behaviors that occurred before, during, and after erection and masturbation, and to identify change in arousal. This study did not find evidence that erection and masturbation are associated with increases in arousal, or to sexual or aggressive behavior toward other horses. The possible presence or induction of erection or masturbation alone might not limit male horses from participating in certain handling, training, or riding contexts. These findings, along with further research, may be used to inform interpretations of horse–human interactions that involve erection or masturbation.

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“…Both estradiol and testosteronedby itself or through aromatization at the encephalic tissue [43,54,55]dare considered to be implicated in sexual behavior of the stallion. However, despite the strong suppression of both testosterone and estrone sulfate seen in the present study with acyline, changes in libido were only evident in respect to increased number of collection failures (>15 minutes required for semen collection) in the acyline-treated stallions.…”

Section: Discussionmentioning

confidence: 99%

Reversible downregulation of the hypothalamic-pituitary-gonadal axis in stallions with a novel GnRH antagonist

et al. 2016

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Gonadotropin releasing hormone (GnRH) affects precopulatory behavior in testosterone-treated geldings

Cited by 16 publications

References 15 publications

Gonadotropin-Releasing Hormone in Third Ventricular Cerebrospinal Fluid of the Heifer During the Estrous Cycle1

Gonadotropin-Releasing Hormone in Third Ventricular Cerebrospinal Fluid of the Heifer During the Estrous Cycle1

Aggression, Erection, and Masturbation in Feral Pottoka Ponies and Implications for Equine Welfare

Reversible downregulation of the hypothalamic-pituitary-gonadal axis in stallions with a novel GnRH antagonist

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